Im torn on the benefits of
UV light for plants.
My wife uses
UV plant lights on a couple of our house plants and her friend grows rare plants as a semi-commercial hobby and recommends
UV. But it seems to be universally not recommended when it comes to aquatic plants.
Aquarium
UV tends to be sealed units to kill off bacteria and parasites, and i would tend to agree that having fish exposed to
UV would be risky. But if you had a plant only tank or refugium i cant see why
UV wouldnt promote fast growth of plants. Ive read speculation that
UV causes genetic defects in plants, but without evidence. Plants grow outside with plenty of
UV and no issues, and as said someone that specialises in rare plants recommends its use. As far as im aware
UV promotes fast growth, which is what you are after to consume nutrients.
Im fairly sure that ive read that specialist planted aquarium lights give out some
UV, but probably not as much as a
UV light.